56123501281 has 2 divisors, whose sum is σ = 56123501282. Its totient is φ = 56123501280.

The previous prime is 56123501261. The next prime is 56123501347. The reversal of 56123501281 is 18210532165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43821142225 + 12302359056 = 209335^2 + 110916^2 .

It is a cyclic number.

It is not a de Polignac number, because 56123501281 - 2¹⁹ = 56122976993 is a prime.

It is a super-2 number, since 2×56123501281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56123501251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28061750640 + 28061750641.

It is an arithmetic number, because the mean of its divisors is an integer number (28061750641).

Almost surely, 2^56123501281 is an apocalyptic number.

It is an amenable number.

56123501281 is a deficient number, since it is larger than the sum of its proper divisors (1).

56123501281 is an equidigital number, since it uses as much as digits as its factorization.

56123501281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 56123501281 in words is "fifty-six billion, one hundred twenty-three million, five hundred one thousand, two hundred eighty-one".